[tor-bugs] #17873 [- Select a component]: replacing 0.0.0.0 listeners at runtime fails

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#17873: replacing 0.0.0.0 listeners at runtime fails
--------------------------------------+-----------------
     Reporter:  cypherpunks           |      Owner:
         Type:  defect                |     Status:  new
     Priority:  Medium                |  Milestone:
    Component:  - Select a component  |    Version:
     Severity:  Normal                |   Keywords:
Actual Points:                        |  Parent ID:
       Points:                        |    Sponsor:
--------------------------------------+-----------------
 I had DNSPort 0.0.0.0:53 set. Some jerks on the internet started flooding
 me with DNS requests so I reconfigured tor to only have the DNSPort on my
 LAN interface. I sent tor a HUP to reload the config, and it exited
 because it tried to bind the new listener before unbinding the old one:

 {{{
 Dec 16 16:19:51.000 [notice] Opening DNS listener on 172.16.0.1:53
 Dec 16 16:19:51.000 [warn] Could not bind to 172.16.0.1:53: Permission
 denied
 Dec 16 16:19:51.000 [notice] Closing no-longer-configured DNS listener on
 0.0.0.0:53
 Dec 16 16:19:51.000 [warn] Failed to parse/validate config: Failed to bind
 one of the listener ports.
 Dec 16 16:19:51.000 [err] Reading config failed--see warnings above. For
 usage, try -h.
 Dec 16 16:19:51.000 [warn] Restart failed (config error?). Exiting.
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17873>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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